OK, let's crack this. We're given 128 and our task is to multiply it by 87. Essentially, we'll be adding 128 to itself 87 times.
Step 1: 0 + 128 = 128
Step 2: 128 + 128 = 256
Step 3: 256 + 128 = 384
Step 4: 384 + 128 = 512
Step 5: 512 + 128 = 640
Step 6: 640 + 128 = 768
Step 7: 768 + 128 = 896
Step 8: 896 + 128 = 1024
Step 9: 1024 + 128 = 1152
Step 10: 1152 + 128 = 1280
Step 11: 1280 + 128 = 1408
Step 12: 1408 + 128 = 1536
Step 13: 1536 + 128 = 1664
Step 14: 1664 + 128 = 1792
Step 15: 1792 + 128 = 1920
Step 16: 1920 + 128 = 2048
Step 17: 2048 + 128 = 2176
Step 18: 2176 + 128 = 2304
Step 19: 2304 + 128 = 2432
Step 20: 2432 + 128 = 2560
Step 21: 2560 + 128 = 2688
Step 22: 2688 + 128 = 2816
Step 23: 2816 + 128 = 2944
Step 24: 2944 + 128 = 3072
Step 25: 3072 + 128 = 3200
Step 26: 3200 + 128 = 3328
Step 27: 3328 + 128 = 3456
Step 28: 3456 + 128 = 3584
Step 29: 3584 + 128 = 3712
Step 30: 3712 + 128 = 3840
Step 31: 3840 + 128 = 3968
Step 32: 3968 + 128 = 4096
Step 33: 4096 + 128 = 4224
Step 34: 4224 + 128 = 4352
Step 35: 4352 + 128 = 4480
Step 36: 4480 + 128 = 4608
Step 37: 4608 + 128 = 4736
Step 38: 4736 + 128 = 4864
Step 39: 4864 + 128 = 4992
Step 40: 4992 + 128 = 5120
Step 41: 5120 + 128 = 5248
Step 42: 5248 + 128 = 5376
Step 43: 5376 + 128 = 5504
Step 44: 5504 + 128 = 5632
Step 45: 5632 + 128 = 5760
Step 46: 5760 + 128 = 5888
Step 47: 5888 + 128 = 6016
Step 48: 6016 + 128 = 6144
Step 49: 6144 + 128 = 6272
Step 50: 6272 + 128 = 6400
Step 51: 6400 + 128 = 6528
Step 52: 6528 + 128 = 6656
Step 53: 6656 + 128 = 6784
Step 54: 6784 + 128 = 6912
Step 55: 6912 + 128 = 7040
Step 56: 7040 + 128 = 7168
Step 57: 7168 + 128 = 7296
Step 58: 7296 + 128 = 7424
Step 59: 7424 + 128 = 7552
Step 60: 7552 + 128 = 7680
Step 61: 7680 + 128 = 7808
Step 62: 7808 + 128 = 7936
Step 63: 7936 + 128 = 8064
Step 64: 8064 + 128 = 8192
Step 65: 8192 + 128 = 8320
Step 66: 8320 + 128 = 8448
Step 67: 8448 + 128 = 8576
Step 68: 8576 + 128 = 8704
Step 69: 8704 + 128 = 8832
Step 70: 8832 + 128 = 8960
Step 71: 8960 + 128 = 9088
Step 72: 9088 + 128 = 9216
Step 73: 9216 + 128 = 9344
Step 74: 9344 + 128 = 9472
Step 75: 9472 + 128 = 9600
Step 76: 9600 + 128 = 9728
Step 77: 9728 + 128 = 9856
Step 78: 9856 + 128 = 9984
Step 79: 9984 + 128 = 10112
Step 80: 10112 + 128 = 10240
Step 81: 10240 + 128 = 10368
Step 82: 10368 + 128 = 10496
Step 83: 10496 + 128 = 10624
Step 84: 10624 + 128 = 10752
Step 85: 10752 + 128 = 10880
Step 86: 10880 + 128 = 11008
Step 87: 11008 + 128 = 11136

So, 128*87 = 11136